Hello Manfred,
Yes, I understand the importance of each conductor being insulated and
woven to bring stands in and out of the bundle, that's what I have
that's so hard to strip the enamel off. I only used the speaker wire
as it is very flexible, pure copper strands and of a large cross
section for current handling. As you rightly warned, a 2mm or 2mm +
solid enamelled wire is not easy to wind tightly by hand with the
number of turns i built the second one with. I'd use the Litz for sure
if I could strip the damned stuff with recourse to spending hours with
paint stripper. i tried cellulose thinners, 2 other types of paint
remover, very strong caustic soda, everything I had that I thought
might work. The solder pot had no real effect on the enamel... :(
Thanks again!
On Tuesday, May 16, 2017, you wrote:
> Chris,
>> I stacked 3 off 78 material cores in the same size as the 77 material
>> toroids and wound them with 180 strand speaker wire with a conductor
>> diameter of about 2mm.
> This sounds like you misunderstood one thing: That speaker wire surely
> has no insulation between the individual strands, and so it will behave
> exactly like a solid wire, in terms of RF performance. To achieve an
> improvement over solid wire you need to have INSULATED strands! And
> ideally they should be woven in a very specific way, so that each strand
> is on the surface and inside the bundle as much as any other strands.
> The Litz wire suggested by Roger is exactly what you want, but it's
> relatively rare and expensive. What's typically done is assembling a
> bundle from many thin enameled wires, or winding with several enameled
> wires in parallel.
> Manfred
--
Best regards,
Chris mailto:chris@chriswilson.tv
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